<template>
  <div class="app-container">
    课程列表
    <!--查询表单-->
    <el-card class="operate-container" shadow="never">
      <el-form :inline="true" class="demo-form-inline">
        <el-form-item label="课程名称">
          <!-- <el-input v-model="searchObj.name" placeholder="讲师名" />  -->
<!--          <el-autocomplete-->
<!--            v-model="searchObj.courseName"-->
<!--            :fetch-suggestions="querySearch"-->
<!--            :trigger-on-focus="false"-->
<!--            class="inline-input"-->
<!--            placeholder="课程名称"-->
<!--            value-key="courseName">-->
<!--          </el-autocomplete>-->
          <el-input v-model="searchObj.courseName" placeholder="请输入关键字"></el-input>
        </el-form-item>
        <el-form-item label="开设学期">
          <el-input v-model="searchObj.semester" placeholder="yyyy-x"></el-input>
        </el-form-item>

        <el-button type="primary" icon="el-icon-search" @click="fetchData()">查询</el-button>
        <el-button type="default" @click="resetData()">清空</el-button>
      </el-form>
    </el-card>
    <!-- 工具按钮 -->
    <el-card class="operate-container" shadow="never">
      <i class="el-icon-tickets" style="margin-top: 5px"></i>
      <span style="margin-top: 5px">数据列表</span>
      <el-button class="btn-add" @click="batchRemove()" >批量删除</el-button>
    </el-card>
    <!-- 表格 -->
    <el-table
      :data="list"
      border
      stripe
      @selection-change="handleSelectionChange">
      <el-table-column type="selection"/>
      <el-table-column
        label="#"
        width="50">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>
      <el-table-column prop="courseName" label="课程名称" width="80" />
      <el-table-column prop="teacherName" label="教师名称" width="80"/>
      <el-table-column prop="courseInfo" label="简介" />
      <el-table-column prop="semester" label="开设学期" width="160" />
      <el-table-column prop="publishTime" label="发布时间" width="160" />
      <el-table-column label="操作" width="200" align="center">
        <template slot-scope="scope">
          <el-button type="text" size="mini" @click="removeById(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页组件 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[5, 10, 20, 30, 40, 50, 100]"
      style="padding: 30px 0; text-align: center;"
      layout="total, sizes, prev, pager, next, jumper"
      @size-change="changePageSize"
      @current-change="changeCurrentPage"
    />
  </div>
</template>
<script>
import courseApi from '@/api/course/course'
export default {
  data() {
    return{
      list: [], // 讲师列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
      searchObj: {}, // 查询条件
      multipleSelection: [],// 批量删除选中的记录列表
    }
  },
  created(){
    this.fetchData()
  },
  methods:{
    handleSelectionChange(selection){
      this.multipleSelection = selection
    },
    fetchData(){
      courseApi.pageList(this.page,this.limit,this.searchObj)
        .then(response => {
          this.list = response.data.records
          this.total = response.data.total
        })
    },
    changePageSize(size){
      this.limit = size;
      this.fetchData()
    },
    changeCurrentPage(page){
      this.page = page;
      this.fetchData()
    },
    resetData(){
      this.searchObj={}
      this.fetchData()
    },
    removeById(id){
      this.$confirm('此操作将删除讲师信息, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return courseApi.removeCourseId(id)
      }).then((response) => {
        this.fetchData()
        this.$message.success(response.msg)
      })
    },
    batchRemove(){
      if (this.multipleSelection.length === 0) {
        this.$message.warning('请选择要删除的记录！')
        return
      }
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        // 点击确定，远程调用ajax
        // 遍历selection，将id取出放入id列表
        var idList = []
        this.multipleSelection.forEach(item => {
          idList.push(item.id)
        })
        // 调用api
        return courseApi.batchRemove(idList)
      }).then((response) => {
        this.fetchData()
        this.$message.success(response.msg)
      }).catch(error => {
        if (error === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    },
  }
}
</script>
